Why redirect? Why not have all posted info simply being shown / fed back to the user in the success message?

The success message can show/reference and form input field via {variables} (see tracking page for variable names for each input field).

The layout however would be the same for each post/page this form is on.

If you want to change the actual structure of this success message you need to work with a hidden container (= hidden input field) & the my-functions.php file (& its filter routines).

The hidden field (container) would include your success message that you can alter via PHP to whatever you want and pass it on to the hidden field. The success message would then in-turn only reference this {hiddenfield} when shown.

Hope this makes sense, there are quite some threads on this very same topic, try also the forum search (e.g. "my-functions.php", "+hidden +field", etc.).